I missed a file that needed to be updated for the removal of -mfloat32. Committed.
paul ChangeLog: 2018-10-08 Paul Koning <n...@arrl.net> * config/pdp11/t-pdp11: Remove -mfloat32 switch. Index: config/pdp11/t-pdp11 =================================================================== --- config/pdp11/t-pdp11 (revision 264938) +++ config/pdp11/t-pdp11 (working copy) @@ -5,4 +5,4 @@ LIB2ADD = $(srcdir)/udivmod.c \ $(srcdir)/memmove.c \ $(srcdir)/memset.c -HOST_LIBGCC2_CFLAGS += -O2 -mfloat32 +HOST_LIBGCC2_CFLAGS += -O2